The K-Mesic atom

Assuming that the Y¹_o(1405) resonance dominates the $\text{K}\text{N}$ system at threshold, we show in a three-body K^?d model that to get the correct sign of the real part of the kaon-nucleus optical potential, we must use an off shell $\text{K}\text{N}$ amplitude and that higher $\text{K}\text{N}$ multiple scattering including intermediate nuclear excitations are important.